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description: Frederick Albert Kempf (born 14 October 1977) is a British pianist born in Croydon to a German father and a Japanese mother. He lives in Berlin. Early life Kempf was born in Croydon. He was educated
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subject of: OpenTimestamps Proof of Existence
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album: Kempf plays Rachmaninov, Bach-Busoni, Ravel & Stravinsky
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album: Kempf plays Rachmaninov, Bach-Busoni, Ravel & Stravinsky
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track: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": II. Adagio cantabile
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track: Piano Sonata No. 31 in A-Flat Major, Op. 110: I. Moderato cantabile molto espressivo
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track: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
track: 12 Études, Op. 25: No. 11 in A Minor, "Winter Wind": Lento - Allegro con brio
track: Études, Op. 10: No. 8, Étude in F Major "Sunshine"

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Études, Op. 10: No. 3 in E Major "Tristesse"
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": I. Grave - Allegro di molto e con brio
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T05:15:54Z
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T09:37:10Z
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Fantaisie Impromptu in C-Sharp Major, Op. 66: Allegro agitato
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Fantaisie Impromptu in C-Sharp Major, Op. 66: Allegro agitato
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Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo: Allegro
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by artist: Ludwig van Beethoven
by artist: Freddy Kempf
in album: Beethoven Works 101
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popularity: 3
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
audio: Piano Sonata No. 8 in C Minor, Op. 13 "Pathétique": III. Rondo: Allegro
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
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by artist: Ludwig van Beethoven
by artist: Freddy Kempf
in album: Beethoven 250
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popularity: 2
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": III. Presto agitato
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Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
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duration: PT1M56S
duration ms: 116520
explicit: false
by artist: Ludwig van Beethoven
by artist: Freddy Kempf
in album: Beethoven 250
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popularity: 1
genre: classical
genre: classical-piano
genre: chamber-music
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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  value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T23:30:38Z
audio: Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": II. Allegretto
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12 Études, Op. 25: No. 11 in A Minor, "Winter Wind": Lento - Allegro con brio
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by artist: Freddy Kempf
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: 12 Études, Op. 25: No. 11 in A Minor, "Winter Wind": Lento - Allegro con brio
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Études, Op. 10: No. 8, Étude in F Major "Sunshine"
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Études, Op. 10: No. 8, Étude in F Major "Sunshine"
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